As Bill Belichick makes moves at the end of the roster, they are not random. Every player he picks up is intended to be a potential contributor in 2015. The moves also serve a dual role to motivate the existing players at the position and send the message that everyone’s job is in jeopardy. Investigating the moves made by Belichick at the backend of the roster shows where he thinks the team needs improvement heading into the first preseason game. Here are four positions where the recent moves show Belichick is not happy with the results to date.